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RE: Subgrade Modulus for Mat Foundations

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Title: Subgrade Modulus for Mat Foundations
+ additional parameters if post-tensioned & calcd per PTI method (rectangular only?).
The "best" soils reports I have seen so far require the mat slab be able to span a void of 10' diameter, and able to cantilever 5' at any edges! No other requirements!
Suresh Acharya, S.E. 

From: Souther, Joseph [mailto:SoutherJT(--nospam--at)]
Sent: Thursday, January 29, 2009 10:00 AM
To: seaint(--nospam--at)
Subject: Subgrade Modulus for Mat Foundations

As a geotechnical engineer, I wish to provide geotechnical design parameters to the structural engineer for design of a large (100 to 200 foot) circular mat foundation. What parameters does the structural expect? What units (US job) are used for the design?


Joseph T Souther, PE
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